[Zope] Bug in <dtml-comment> ?

I've discovered that the following does not work: <dtml-comment> <dtml-let thisvariable="'some string'"> </dtml-comment> Some text that used to be inside a dtml-let tag . . . <dtml-comment> </dtml-let> </dtml-comment> This is the error I get upon clicking "Change":

Document Template Parse Error

unexpected end tag, for tag </dtml-comment>

What's happening is that *within* the dtml-comment tags, Zope is keeping track of the dtml-let tag, and won't let me continue until I close the dtml-let *inside* of the comment. I would expect that anything inside a <dtml-comment> would be ignored by Zope . . . Is this a bug, or is this an intentional behaviour I don't understand? Thanks, CJ